Propulsion Shaft Alignment

Marine propulsion shaft alignment is a core part of LLT’s business. With respect to existing alignment problems, we take a Systems Engineering approach. All aspects of the shaftline alignment are investigated by using a combination of analytical modeling, on-site measurements, documentation review, and analysis of the operating environment, bearing/seal design and shipyard construction practices. A least-cost solution is sought. Alignment services include the following:Theoretical Modeling

Specification of Alignment Procedures: sequence and method of installation, and gap/sag values if applicable

Measurements

Bearing Reactions using the strain gauge technique and Jack-up Method

Bearing offsets are estimated from the measured reactions and the influence coefficients.

Comparisons are made of the measured condition relative to the prescribed condition and the alignment criteria.

Recommendations for adjustments to bearing offsets, if required, are provided on-site. Most cost-effective solution is sought.

Monitoring Systems designed specifically for each vessel are offered. Such systems can result in significant cost savings by reducing maintenance costs, and the inspection frequency of the propeller shafting and bearings

Analysis and Reporting

Results are provided on-board the vessel. This includes an assessment as to the alignment condition and what, if any, action is required. A formal Engineering report is submitted within two weeks of the completion of the tests.